I doubt that his son Jong-un will be able to fully consolidate his leadership. Jong-un has 2 older brothers, Jong-nam and Jong-chul, the first was groomed for the top spot for many years. I doubt that he will just roll over.

Either the brothers are already dead, or they've worked for years to consolidate their power against Jong-un and a power struggle will ensue. It will come down to whoever the Army backs.